Diamond-grinder.



F. RIES.

DIAMOND GRINDER.

APPLICATION FILED APR. 13. 1917.

Patented June 11, 1918.

4 SHEETSSHEET I.

I awuemtoz F. RIES.

DIAMOND GRINDER.

APPLICATION FILED APR. 13. 1 917.

1,269,002. Patented June 11, 1918.

4 SHEETSSHEET 2.

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F. RIES.

DIAMO BINDER.

APPLICATION APR-13, I917- 1,269,002., Patnted June 11, 1918.

4 SHEETS-SHEET 3- F. RIES.

DIAMOND GRINDER.

APPLICATION FILED APR. 13. 1911.

Patented June 11, 1918.

4 SHEETSSHEE'T 4.

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3 nvemto'c L Y Fae. i7 g m a cutting and FERDINAND IBIES, OF NEW YORK, N. Y. 7

DIAMOND-GRINDER.

Specification of Letters Patent. Patented June 11,1918,

Application filed April 13, 1917. Serial No. 161,725.

To all whom it may concern Be it known that I, FERDINAND Rras, residing at New York, in the county of New York and State of New York, have invented a new and Improved Diamond-Grinder, of which the following specification is a full disclosure.

This invention deals with mechanism for polishing precious stones, such as diamonds, and it proposes a simple, com pact, inexpensive and convenient apparatus for this purpose.

Heretofore devices for successfully polishing stones have been commercially available, but said devices have either been of restricted capacity because of the necessity of releasing the gem in order to reposition it for the different facets and have therefore been inconvenient to use.

The primary object of this invention is to create and render available an apparatus which will not only be of the utmost convenien'ce in point of usage, but will also be sufiiciently simple to enable it to be manufactured and sold at a price within the reach of all those having need for such advices.

.Other objects will be in part obvious from the annexed drawings and in part indicated in connection therewith by the following analysis of this invention.

This invention accordingly consists in the ,features of iconstruction, combfinairion of parts and in the unique relations of the members and in the relative proportioning and disposition thereof; all as more completely outlined herein.

To enable others skilled in the art so fully to comprehend the underlying features thereof that they may embody the same by the numerous modifications in structure and relation contemplated by this invention, drawings depicting a preferred form have been annexed as a part of this disclosure, and in such drawings, like characters of reference denote corresponding parts throughout all the views, of which V Figure 1 isa side elevation of an apparatus embodying this invention showing the different parts thereof in position for inding a stone. Fig. 2 is a section throug line 11-11 of Fig. 1 showing the details of the mounting of the so-called guillotine. Fig. 3 is a rear elevation of the apparatus, certain parts being broken away. Fig. 4 is a plan of the apparatus showing all the elements thereof duly assembled. Fig. 5 is a section through line VV of Fig. 4 showing in detail the adjusting means for the dop holder. F g. 6 is a section through line VI-VI of Fig. 4 showing the details of the dop and the fingers for determining the position of the same. Fig. 7 is a bottom view of the dop. Fig. 8 is a view of a finger for determining the position of the stone. Fig. 9 is a view of the end of the arm supporting the dop holder showing the numbering thereon for assisting the grinder in cutting the stone. Fig. 10 is a View of the tongs for determining the position of the stone for the diflerent settings thereof. Fig. 11 shows a modified form of tongs. Fig. 12 is a detached view of a simplified modification of the dop and adjacent parts. Fig. 13 is an end elevation of the same. Fig. 14 is a bottom view thereof. Fig. 15 is a section through line XV- XV; and Figs. 16,17 and 18 are perspectives of difl'erent forms of fingers for affixing the position of the stone.

eferring to the drawings, this apparatus is designed to be positioned on the table A which is adjacent a conventional lap or rotating wheel employed in polishing diamonds. This apparatus consists of a base B V which is retained by a pin 1 in definite relation with the main table A and is also provided with two leveling screws 2 and 3 at its forward end. Surmounting this base is a frame C which is slidably connected to the base B by means of a dovetail slideway 4a which extends horizontally so as to permit the frame to be moved toward and away from the lap for purposes of adjusting the position thereon of the stone. A thumbscrew 5 serves to secure the frame C in its adjusted position. This frame provides a vertical slideway formed of the risers 6 and 7 and the retaining strips 8 and 9.

A carriage D slldes freely up and down in the ways of these uprights and this carriage in turn supports the various elements which position the gem on the lap. The carriage is formed of a body portion 10 provided with sliding surfacesand a boss 11 which receives the stem 12 of a socket member E. This boss 11 is split at 13 and is provided with a clamping screw 14 to enable the stem 12 to be rigidly clamped against turning after it has been set in its predetermined position. It may be explained here that by lifting the carriage D the gem is removed from the lap and may be insptected or adjusted and for the purpose of controlling the cutting of the stone and the inspection thereof it is desirable to conveniently add to the weight of the carriage or to counter-balance the same. To that 'end, a bifurcated lever 15 is pivoted to the boss 16 extending laterally from the wing 17 and this lever embraces the boss 11 of the carriage D. Pivoted adjacent the lever 15 is an arm 18 which has a knuckle joint in connection with the lever 15 so that when it is inthe position shown by Figs. 1 and t the weight 19 will bear down the lever 18 and this in turn will act through the lip 20 to engage the shoulder 21 of the lever 15 with the efiect that said bifurcated lever will be uplifted and exert a corresponding pressure on the carriage D thereby compensating for the weight thereof. In order that this may be regulated, the weight 19 is adjustable along the arm 18 and may be fixed in any predetermined station thereon by means of a thumbscrew 21. Accordingly, when it is desired to uplift the carriage D it will be convenient to swing over the weight 19 and compensate thereby for the weight of thecarriage which will render easy its rising. This is further facilitated by means of another lever 22 which is pivoted at 23 to a stud 24 projecting laterally from the wing 25. Said lever 22 extends alongside of the main portion 10 of the carriage D and takes under a roller 26 carried by a, pin 27 secured to the face of the carriage D. The lever has a thumb-piece 28 whereby it may be depressed to raise the carriage and enable the carriage to be held uplifted for a while, a pawl 29 is pivoted at 30 to the carriage and by means of a spring 31 is normally held against a stop pin 32 so that when the carriage is lifted this pawl 29 may catch on the pin 33 projecting from the upper cross-piece 34: of the arm C and thereby hold the carriage in its elevated position. To limit the downward movement of the carriage, a stem 35 extends upwardly and passes through a hole 36 in the cross-piece 34 and terminates in a.

threaded end 37 which carries a thumbscrew 38 which may he graduated in correspond ence with a scale on the frame (3 to indicate the downward movement of the carriage and to limt the same to any predetermined degree.

As the gem is being worn away by the lap, the carriage will gradually descend and inorder that the extent of this movement may be readily and closely followed, a sensitive indicator is associated with the min riage so as to magnify the movements thereof when in its lower or gem-cutting position. To avoid interference during the uplifting of the carriage D this indicator is detachably connected with the carriage. This is accomplished by pivoting an elongated needle or pointer 39 to a stud 40 naeo ooa cator39, but when the carriage is down,

contact will be established with the consequence that the extreme end 4:3 of the lever will move rapidly and the extent of the movement will be indicated by a scale 44: secured'to the frame C as shown best by Fig. 2. By means of the construction thus far described, the rate of wear of a gem is accurately under observation at all times and its extent is easily limited and the gem can readily be lifted for purposes of inspection, etc.

In order to enable angles for cutting the different facets to be accurately determined, this invention proposes various elements so concatenated that the angular relation of the one to the other can be readily Varied and adjusted to enable the stone to be sloped at any angle and in any direction such as would be needed for purposes of cutting the When the carriage D is ture of a socket member pivoted to the,

carriage D about a horizontal axis an adapted to be secured in its position by means of the clamp screw 14, and this element E is provided with a pointer 45 (see Fig. 1) whlch cooperates with the scale 46 on the carriage D. This enables the angular relation between the parts to be always under inspection and control. A thumbscrew 47 bearing against the lower part of the memberE in ofi'set relation with its pivot assists in levelin the parts and in securing an accurate settlng of the element E with relation to carriage D.

An elongated arm F preferably in the nature of a rod extends from the socket member to the lap which is at some distance away and at its extremity carries certain other elements providing for angular. adjustments. This arm F passes through a horizontal bore in the. socket! member E and may be clamped in any desired angular relation therewith by means of the clamp screw 48 compressing the wings 49 of the saw-cut 50. In order to facilitate the attainment of any desired angular relation this invention proposes ad-- justing means consisting of an L-shaped abutment 51 rising from the arm and terminating along side of a movable stop-pin 52 which rises upwardly from a part 53 screw-threaded to an adjusting screw 5a. A scale 55 enables the position of the stoppm 52 to be accurately ascertained and thus to obtain an accurate angular adjustment of the bore or arm F by bringing the abutment 51 thereof into contact with the pin 52.

At its outer end the arm F is squared as indicated by 56 and it is provided with an aperture 57 for receiving the stem 58 of the member G. A clamping-nut 59 is screwthreaded through said stem and enables the part G to be positioned in any one of eight different relations with the arm F; said relations being indicated by numerals 60 to enable the user to cut stones in accordance with the conventional system. The lower end of the member G is bifurcated and receives a holder H which is pivoted thereto about a horizontal axis by means of the pin 61. A lock-nut 62 holds the parts together.

The holder H in the simplified modification as shown by Figs. 12 to 14 has an extension 63 projecting transversely to the pivot 61 so as to be located in ofi'set relation therewith. It is provided also with a socket 64 which is tapered and is adapted to receive the conical end 65 of the collet I. A nut 66 screw-threaded to the threaded stem 67 of the collet serves to draw it home and lock it in position. It is desirable, in order that difi'erent facets of the stone may be cut, to affix the collet I in different positions in the holder H and to enable this to be done accurately, the collet is provided with a circular flange 68 knurled so that it may be readily turned by the fingers and having a circumferential series of holes 69 which may be registered with the index pin 70 that is mounted in the socket 71 in the extension 63 by means of a spring 72 has its slightly tapered end thrust into the selected hole. These holes are numbered alternately from 1 to 8 as shown by Fig. 7, for the guidance of the user in indexing the collet I.

The gem is embedded in a conical dop J which is seated in the conical socket 73 of the collet I.

A very important characteristic of this invention resides in the instrumentalities for enabling the gem under oing polishing to be accurately repositione for the different facets. It should here be explained that this gem is partially embedded in position, but it is highly desirable that as much as possible of the gem should be exposed so that a clear view may be had of it and so that the position will not interfere with the polishing. This occasions much trouble owing to the fact that necessarily the "em cannot be firmly held and when it is lifted out of contact with the lap, it is likely to fall out or become more or less displaced. If this happens, it is obvious that the angles must be entirely reset throughout the apparatus described in the foregoing thereby causing a great loss of time and tending to produce imperfect work. I have however, succeeded in devising a system w ereby the will always be held visibly in place.

em To that end, the collet I (see Figs. is fovided with a series of soc ets 74. When the gem is initially mounted in the of prongs L are mounted in said sockets and secured therein by set screws 75 so as to bring the ends of the prongs bearing firmly against the sides and the back of the em, as shown in Fig. 14. This affords a glear and unimpeded region of the gem which can now be placed against the lap by a suitable adjustment of the machine and the polishing of the facet can be completed- When said facet is finished, it becomes necessary to lift up the dop and to reposition it. This requires that one or more of these prongs L shall be removed to clear another region of the gem. According to this invention, another prong will now be inserted in another one of the sockets 74 and brought against the polished facet; one or more'additional prongs being used as may be desired. It is now possible to remove one ormore of the prong-receiving collet, a number original prongs without however permitting the gem to shift its position. The'dop can now be given its new position and the polishing may be again resumed. Theseoperations are continued until it is completed. As shown by Figs. 6 and 8, a supplemental prong M may be used to bear directly against the face of the gem, and in place of using the independent prongs shown by Figs. 16 to 17, a universal prong N such as Figs. 10 or 11 may be used. A holder in this modification is provided with a portion 76 having a socket 77 adapted to receive the stem 78 of the universal prong N and held therein by means of a set screw 79. This universal prong has a pair of fingers 80 and 81 pivotally secured to apart 82 connected with the stem 78. A clamping screw 83 suflices to draw the ends of the fingers 80 and 81 together, like an ordinary pair of dividers to clamp the sides of the gem. In the modification shown by Fig. 11 the fingers 84 form tongs loosely screwthreaded to the shaft 85 which inturn is mounted on a part 86 projecting from the stem 78. The ends of the fingers 84 carry pins 87 that have a certain amount of free play in the slots 88 in the wings 89, the

shown lg whole constituting a self-adjusting device."

12 to 18) l K in the dop J Having thus revealed this invention, ll claim as new and desire to secure the following combinations of steps and elements, or equivalents thereof, by Letters Patent of the United States 1. A machine of the nature disclosed com bining a base; a frame horizontally adjust able thereon and consisting of an upright frame and a carriage vertically slidable thereon; a member horizontally pivoted to said carriage; an arm pivoted transversely to said member; a support vertically pivoted to the extremity of said arm; a member horizontally pivoted to said support; and a Sop holder vertically pivoted to said mem- 2. A machine of the nature disclosed combining an upright frame and a carriage vertically slidable therein; a gem holding instrumentality having movement in all directions mounted on said carriage; means for \counterbalancing the weight of said cartically slidable therein; a gem holding instrumentality having movement in all directlons mounted on said carriage; a pivoted indicating needle having an elongated extension coiiperating with a fixed scale; and means movable with said carriage for acting on said needle closely adjacent its pivot to magnify movements of said carriage.

5. A gem polishing machine including a frame having a vertically movable carriage; a member pivoted to said carriage about a horizontal axis; and elongated arm pivoted to said member transversely to said axis; adusting means for determining the angular relation between said arm. and member; and

a dop adjustably carried by said arm.

6.- A gem polishing machine including a frame having a vertically movable carriage; a socketed member horizontally pivomd to sald carriage; an elongated rod adjustably seated in the socket of said member; a clamping means for determining the angular relation between said two last mentioned parts; and a dop adjustably carried by said arm.

7. A gem polishing machine combining a downwardly movable mechanism having an arm located over a lap; a holder having an ofl'set extension pivoted to said part; a collet depending from said holder and rotatable thereon; and an indexing device for determining the position of said collet.

8. A gem polishing machine combining a downwardly movable mechanism having an arm located over a lap; a collet having a dop-receiving socket and also a number of symmetrically disposed sockets; a gem-carrying dop carried by said collet; and a series of prongs adapted to be individually secured in said sockets and to be independently shifted from one socket to another.

9. A gem-grinding mechanism combining a member provided in its end with a recess adapted to seat a gem; a part having a plurality of sockets disposed around the axis of said seat; a few gem-retaining prongs adapted to be inserted into said sockets each to exert pressure on said gem in the direction of the axis of said member and grouped to expose a predetermined side of the gem to the action of a lap; and means for clamping said prongs in said sockets, whereby the prongs may individually be shifted in succession to other sockets to expose the difierent sides of the gem to the action of the lap without releasing said gem or permitting it to shift its mounting in said seat.

10. A gem-grinding mechanism combining a holder; a mounting for said holder;

indexing means for adjustably fixing theangular relations of said parts; means for seating a gem in definite relation to said holder; a plurality of independent .diversely shaped fingers; and means enabling one or more of said fingers to be independently secured to said holder and to be individually shifted in position; whereby the fixed relation of said gem to said holder will always be maintained by some of said fingersduring the re-adjustment of other fingers;

In witness whereof, ll hereunto subscribe my name, as attested by the two subscribing witnesses,

FERDINAND REES.

Winesses B. COOKE, N. SCHWARTZ. 

